I do feel that the human mind is "given the power to distort" as they say at the end- so that we can deal with pain/reality. A physical thing happens when someone feels trauma for example- and disassociation can be powerful. But what they're talking about is lying to feel better about the self- and I almost think that doing that is delusional if not intentional. People who have overconfidence are not intentionally that way I don't think. Convincing yourself that you are the best can calm the nerves- but that's super intentional. I used to do that while walking to school all the time if I had a test bec I had extreme test anxiety. Telling myself that I was going to do really well made me feel better- but it didn't necessarily make me believe I was the best.